* Strips invalid XML characters from the input string.
     *
     * This method removes characters that are not allowed in XML documents
     * according to the XML 1.0 specification. Valid characters include:
     * - Tab (0x9)
     * - Line feed (0xA)
     * - Carriage return (0xD)
     * - Any character between 0x20 and 0xD7FF
     * - Any character between 0xE000 and 0xFFFD
     * - Any character between 0x10000 and 0x10FFFF
     *

        assertEquals("  bothSpaces  ", testTransformer.getName());

        // Only whitespace
        testTransformer.setName("   ");
        assertEquals("   ", testTransformer.getName());

        // Tab characters
        testTransformer.setName("\tname\twith\ttabs\t");
        assertEquals("\tname\twith\ttabs\t", testTransformer.getName());

        // Newline characters